PRESONUS StudioLive CS18AI Visual Quickstart Manual page 17

Gate. Encoders in the Gate section control the Threshold, Range, Attack, and Release for the Fat
Channel Gate. An On button turns the Gate processing on/of and an Edit button brings up
additional parameters on the touch screen.
On the touch screen view for the Gate you can see a graph representing
the Gate settings, the Gate gain reduction meter, source selection for the
side chain, a key input listen button, and a button for switching between
Gate and Expander modes.
Compressor. The Compressor section has encoders for Threshold, Ratio, Attack, Release, and
Gain. An On button turns the Compressor processing on/of and an Edit button brings up
additional parameters on the touch screen.
On the touch screen view for the Compressor you can see a graph
representing the Compressor settings and buttons to enable Auto attack/
release and Soft Knee compression.
Limiter. A single encoder and button in the Limiter section provide control for the Threshold
and on/off functionality.